钢渣基多孔地质聚合物的制备及吸附性能研究

Preparation and Adsorption Properties of Steel Slag Based Porous Geopolymer

以钢渣为主要原料,水玻璃为激发剂,H_(2)O_(2)为发泡剂,制备多孔地质聚合物材料。采用XRD、FTIR、SEM、BET等对原料及最终试样进行表征,研究钙硅比、激发剂和H_(2)O_(2)掺量对该材料性能的影响。将所制备的多孔地质聚合物用作吸附剂,初步考察该材料对Cu^(2+)的吸附效果。试验表明:当钙硅比为1.0,水玻璃掺量为20.4%(质量分数),发泡剂掺量为4%(质量分数)时,该材料性能良好,总孔隙率86.4%,抗压强度0.5 MPa,体积密度0.408 g/cm^(3),体积吸水率56.31%,钢渣使用率65.85%,比表面积与孔容显著提高。吸附结果显示:该材料对Cu^(2+)吸附效果良好,去除率可达91.44%,平衡吸附量达到15.239 mg/g,吸附过程符合准二级动力学模型。

Porous geopolymer materials were prepared with steel slag as the main raw material,water glass as the activator and H_(2)O_(2) as the foaming agent.The raw materials and final samples were characterized by XRD,FTIR,SEM and BET.The effects of calcium silicon ratio,activator and H_(2)O_(2) admixture on the properties of the material were studied.The porous geopolymer was used as adsorbent to investigate the adsorption effect of Cu^(2+).It shows that when the calcium-silicon ratio is 1.0,water glass mixing is 20.4%(mass fraction)and foaming agent mixing is 4%(mass fraction),the material performs well,with 86.4%total porosity,0.5 MPa compressive strength,0.408 g/cm^(3) volume density,volume water absorption rate is 56.31%,and steel slag utilization rate is 65.85%,significantly improving the specific surface area and pore capacity.The adsorption results show that the material has a good adsorption effect on Cu^(2+),the removal rate reaches 91.44%,and the equilibrium adsorption amount reaches 15.239 mg/g.The adsorption process conforms to the pseudo-second order.